Theres plenty of video footage of this circulating. Surely enough for a prosecution. We all say things that we regret in the heat of the moment but to strike an official three times has to be enough to cost you your job as a teacher. What sort of a message does this send to his students?
I would support a crowd fund to fund a private prosecution. At least then he can be named and the parents at the school are notified as to the kind of arse they have teaching at the school. Shocking behaviour.